PIC16F946 Datasheet, PDF (34/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
3.1.1.4 RA3/AN3/C1+/VREF+/SEG15
Figure 3-4 shows the diagram for this pin. The
RA3/AN3/C1+/VREF+/COM3/SEG15
pin
is
configurable to function as one of the following:
• a general purpose input
• an analog input for the A/D
• a voltage reference input for the A/D
• analog outputs for the LCD
FIGURE 3-4:
BLOCK DIAGRAM OF RA3/AN3/C1+/VREF+/SEG15
Data Bus
WR PORTA
WR TRISA
D
Q
CK Q
Data Latch
D
Q
CK Q
TRIS Latch
RD TRISA
VDD
VSS
Analog Input or
SE15 and LCDEN
SE15 and LCDEN
TTL
Input Buffer
I/O Pin
RD PORTA
SEG15
SE15 and LCDEN
To A/D Module VREF+ Input
DS41265A-page 32
Preliminary
© 2005 Microchip Technology Inc.